Lenovo 3000 H Series User Manual page 49

Microprocessor and heat sink
Microprocessor fan connector
Memory connector 1
Memory connector 2
Power connector
SATA connectors (4)
Front panel connector
Front USB connectors (2)
Serial (com2) connector
Front audio connector
PCI adapter connector
PCI Express x1 adapter connectors (2)
Battery
PCI Express x16 graphics adapter connector
System fan connector
12v power connector

Hardware Replacement Guide